What Could Have Been the Cause of the Frog Boys' Abduction?

The case of the murdered frog boys remains one of South Korea's most notorious cold cases. Multiple theories have cropped up over the years, some more plausible than others. Forensic experts later found the skulls of three of the boys had been fractured by blunt force trauma. We can only hope that sometime soon, developments in forensic and other investigative technologies reaches a point where we can finally deliver justice to the monster who killed those boys, and covered it up.